All-optical network architecture

US5351146A · kind A · utility

Assignees

• AT&T Bell Laboratories · US
• Digital Equipment Corporation · US
• Massachusetts Institute of Technology · US

Inventors

• Vincent W. S. Chan · Lincoln, US
• Robert G. Gallager · Lexington, US
• Alan J. Kirby · Hollis, US
• Adel A. M. Saleh · Lompoc, US

Key dates

• Filing date: Mar 1, 1993
• Grant date: Sep 27, 1994
• Expiry date: Mar 1, 2013

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04J14/0282
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

There is disclosed the architecture for an all optic network which employs a three level hierarchy using wavelength vision multiplexing. At the lowest level of the hierarchy are Level-0 all optical networks. The Level-0 networks are "local" broadcast networks each of which supports a plurality of access ports and each access port can hear all the local traffic transmitted by all other access ports in the same Level-0 network. Each Level-0 network shares wavelengths internally, but there is extensive reuse of wavelengths among different Level-0 networks. The next higher level, which is the intermediate level, Level-1, is essentially a wavelength router coupled with one or more of the Level-0 networks to provide a wavelength path to one or more directly connect Level-0 networks or, in combination with a Level-2 network, a light path to one or more Level-0 network outside itself. The Level-2 are second level wavelength routing networks which provide light paths, as opposed to wavelength paths, between Level-1 networks. The Level-2 networks may be as simple as fiber trunks alone or they may employ frequency changing devices in addition to wavelength routers and/or spatial switches.